CVE-2026-98585: Linux kernel · eth: fbnic: Avoid rounding zero ring sizes
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in 0160953d8eec75c3c55562158c46442ff1fd410b : update Linux kernel when convenient.
Data as of 26 Oct 2026, 12:55 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 0160953d8eec75c3c55562158c46442ff1fd410b, 491aa3167ae02f219cb2d2de6f4196d28dca03be, 92c9f2ea634d92adff5403d231ebeda683c5685a
Exploitation evidence
Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade Linux kernel to 0160953d8eec75c3c55562158c46442ff1fd410b, 491aa3167ae02f219cb2d2de6f4196d28dca03be or 92c9f2ea634d92adff5403d231ebeda683c5685a.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix is available in the Linux kernel, as indicated by the presence of fixed commit versions. Users should update to a Linux kernel version that includes these fixes to resolve the issue. No additional mitigation steps are indicated.
Description
A vulnerability in the Linux kernel's fbnic Ethernet driver involves improper handling of zero ring sizes. The function roundup_pow_of_two() is undefined for zero, and ethtool allows a zero ring size to reach the driver, bypassing the minimum-size check. The fix ensures zero ring sizes remain unchanged while rounding nonzero sizes, allowing the minimum-size check to reject zero deterministically.